no, the effects if this was spread to the natural environment somehow would be comlpetely disastorousHere's a thought... would you by genetically modified fish that have no different external appearance, but have been modified to either
A) secretes an enzyme that breaks down ammonia, Nitrates, and/or nitrites
B) secretes an enzyme that attacks chlorophyll (no live plants, but no algae either)
C) secretes urea as pellets that do not dissolve in water instead of as a liquid.
These are a couple of GM mods that might be beneficial to hobbiests.